Camera optical lens

ABSTRACT

The present disclosure relates to the technical field of optical lens and discloses a camera optical lens. The camera optical lens includes, from an object side to an image side: a first lens having a positive refractive power, a second lens having a positive refractive power, a third lens having a negative refractive power, a fourth lens, a fifth lens and a sixth lens. The camera optical lens satisfies following conditions: −20.00≤f2/f3≤−10.00 and 0.50≤d2/d4≤3.00, where f2 denotes a focal length of the second lens; f3 denotes a focal length of the third lens; d2 denotes an on-axis distance from an image-side surface of the first lens to an object-side surface of the second lens; and d4 denotes an on-axis distance from an image-side surface of the second lens to an object-side surface of the third lens.

TECHNICAL FIELD

The present disclosure relates to the field of optical lens, in particular, to a camera optical lens suitable for handheld devices, such as smart phones and digital cameras, and imaging devices, such as monitors or PC lenses.

BACKGROUND

With the emergence of smart phones in recent years, the demand for miniature camera lens is increasing day by day, but in general the photosensitive devices of camera lens are nothing more than Charge Coupled Device (CCD) or Complementary Metal-Oxide Semiconductor Sensor (CMOS sensor), and as the progress of the semiconductor manufacturing technology makes the pixel size of the photosensitive devices become smaller, plus the current development trend of electronic products towards better functions and thinner and smaller dimensions, miniature camera lens with good imaging quality therefore have become a mainstream in the market. In order to obtain better imaging quality, the lens that is traditionally equipped in mobile phone cameras adopts a three-piece or four-piece lens structure. Also, with the development of technology and the increase of the diverse demands of users, and as the pixel area of photosensitive devices is becoming smaller and smaller and the requirement of the system on the imaging quality is improving constantly, the five-piece, six-piece and seven-piece lens structure gradually appear in lens designs. There is an urgent need for ultra-thin wide-angle camera lenses which with good optical characteristics and fully corrected aberration.

BRIEF DESCRIPTION OF DRAWINGS

FIG. 1 is a schematic diagram of a structure of a camera optical lens according to Embodiment 1 of the present disclosure.

FIG. 2 is a schematic diagram of a longitudinal aberration of the camera optical lens shown in FIG. 1.

FIG. 3 is a schematic diagram of a lateral color of the camera optical lens shown in FIG. 1.

FIG. 4 is a schematic diagram of a field curvature and a distortion of the camera optical lens shown in FIG. 1.

FIG. 5 is a schematic diagram of a structure of a camera optical lens according to Embodiment 2 of the present disclosure.

FIG. 6 is a schematic diagram of a longitudinal aberration of the camera optical lens shown in FIG. 5.

FIG. 7 is a schematic diagram of a lateral color of the camera optical lens shown in FIG. 5.

FIG. 8 is a schematic diagram of a field curvature and a distortion of the camera optical lens shown in FIG. 5.

FIG. 9 is a schematic diagram of a structure of a camera optical lens according to Embodiment 3 of the present disclosure.

FIG. 10 is a schematic diagram of a longitudinal aberration of the camera optical lens shown in FIG. 9.

FIG. 11 is a schematic diagram of a lateral color of the camera optical lens shown in FIG. 9.

FIG. 12 is a schematic diagram of a field curvature and a distortion of the camera optical lens shown in FIG. 9.

DETAILED DESCRIPTION OF EMBODIMENTS

To make the objects, technical solutions, and advantages of the present disclosure clearer, embodiments of the present disclosure are described in detail with reference to accompanying drawings in the following. A person of ordinary skill in the art can understand that, in the embodiments of the present disclosure, many technical details are provided to make readers better understand the present disclosure. However, even without these technical details and any changes and modifications based on the following embodiments, technical solutions required to be protected by the present disclosure can be implemented.

Embodiment 1

Referring to the accompanying drawings, the present disclosure provides a camera optical lens 10. FIG. 1 shows the camera optical lens 10 of Embodiment 1 of the present disclosure, the camera optical lens 10 includes six lenses. Specifically, the camera optical lens 10 includes, from an object side to an image side: an aperture S1, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5 and a sixth lens L6. An optical element such as an optical filter GF can be arranged between the sixth lens L6 and an image surface S1.

The first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, and the sixth lens L6 are all made of plastic material.

Here, the first lens L1 has a positive refractive power, the second lens has a positive refractive power, and the third lens has a negative refractive power.

A focal length of the second lens L2 is defined as f2, a focal length of the third lens L3 is defined as f3, and the camera optical lens 10 should satisfy a condition of −20.00≤f2/f3≤−10.00, which specifies a ratio of the focal length f2 of the second lens L2 and the focal length f3 of the third lens L3. This can effectively reduce a sensitivity of the camera optical lens and further enhance an imaging quality. Preferably, the camera optical lens 10 further satisfies a condition of −19.75≤f2/f3≤−10.05.

An on-axis distance from an image-side surface of the first lens L1 to an object-side surface of the second lens L2 is defined as d2, an on-axis distance from an image-side surface of the second lens L2 to an object-side surface of the third lens L3 is defined as d4, and the camera optical lens 10 further satisfies a condition of 0.50≤d2/d4≤3.00, which specifies a ratio of the on-axis distance from the first lens L1 to the second lens L2 and the on-axis distance from the second lens L2 to the third lens L3. Within this range, a development towards wide-angle lenses would be facilitated. Preferably, the camera optical lens 10 further satisfies a condition of 0.53≤d2/d4≤2.95.

A total optical length from an object-side surface of the first lens L1 to the image surface Si of the camera optical lens along an optical axis is defined as TTL.

When the focal length f2 of the second lens L2, the focal length f3 of the third lens L3, the on-axis distance d2 from the image-side surface of the first lens L1 to the object-side surface of the second lens L2 and the on-axis distance d4 from the image-side surface of the second lens L2 to the object-side surface of the third lens L3 all satisfy the above conditions, the camera optical lens 10 has an advantage of high performance and satisfies a design requirement of low TTL.

In an embodiment, the object-side surface of the first lens L1 is convex in a paraxial region and the image-side surface of the first lens L1 is convex in the paraxial region.

A focal length of the camera optical lens 10 is defined as f, the focal length of the first lens L1 is defined as f1, and the camera optical lens 10 should satisfy a condition of 0.45≤f1/f≤1.42, which specifies a ratio of the focal length f1 of the first lens L1 and the focal length f of the camera optical lens 10. In this way, the first lens has an appropriate positive refractive power, thereby facilitating reducing an aberration of the system while facilitating a development towards ultra-thin and wide-angle lenses. Preferably, the camera optical lens 10 further satisfies a condition of 0.72≤f1/f≤1.13.

A curvature radius of the object-side surface of the first lens L1 is defined as R1, a curvature radius of the image-side surface of the first lens L1 is defined as R2, and the camera optical lens 10 further satisfies a condition of −1.56≤(R1+R2)/(R1−R2)≤−0.46. This can reasonably control a shape of the first lens L1 in such a manner that the first lens L1 can effectively correct a spherical aberration of the camera optical lens. Preferably, the camera optical lens 10 further satisfies a condition of −0.97≤(R1+R2)/(R1−R2)≤−0.57.

An on-axis thickness of the first lens L1 is defined as d1, and the camera optical lens 10 further satisfies a condition of 0.05≤d1/TTL≤0.15. This can facilitate achieving ultra-thin lenses. Preferably, the camera optical lens 10 further satisfies a condition of 0.08≤d1/TTL≤0.12.

In an embodiment, an object-side surface of the second lens L2 is concave in the paraxial region and the image-side surface of the second lens L2 is convex in the paraxial region.

The focal length of the camera optical lens 10 is defined as f, the focal length of the second lens L2 is defined as f2, and the camera optical lens 10 further satisfies a condition of 10.18≤f2/f≤62.31. By controlling a positive refractive power of the second lens L2 within a reasonable range, correction of the aberration of the optical system can be facilitated. Preferably, the camera optical lens 10 further satisfies a condition of 16.29≤f2/f≤49.85.

A curvature radius of the object-side surface of the second lens L2 is defined as R3, a curvature radius of the image-side surface of the second lens L2 is defined as R4, and the camera optical lens 10 further satisfies a condition of 2.26≤(R3+R4)/(R3−R4)≤31.90, which specifies a shape of the second lens L2. Within this range, a development towards ultra-thin and wide-angle lenses would facilitate correcting a problem of an on-axis aberration. Preferably, the camera optical lens 10 further satisfies a condition of 3.61≤(R3+R4)/(R3−R4)≤25.52.

An on-axis thickness of the second lens L2 is defines as d3, and the camera optical lens 10 further satisfies a condition of 0.04≤d3/TTL≤0.13. This can facilitate achieving ultra-thin lenses. Preferably, the camera optical lens 10 further satisfies a condition of 0.07≤d3/TTL≤0.10.

In an embodiment, the object-side surface of the third lens L3 is convex in the paraxial region and an image-side surface of the third lens L3 is concave in the paraxial region.

A focal length of the third lens L3 is defined as f3, and the camera optical lens 10 further satisfies a condition of −4.26≤f3/f≤−1.34. An appropriate distribution of the refractive power leads to a better imaging quality and a lower sensitivity. Preferably, the camera optical lens 10 further satisfies a condition of −2.66≤f3/f≤−1.68.

A curvature radius of the object-side surface of the third lens L3 is defined as R5, a curvature radius of the image-side surface of the third lens L3 is defined as R6, and the camera optical lens 10 further satisfies a condition of 1.88≤(R5+R6)/(R5−R6)≤6.20. This can effectively control a shape of the third lens L3, thereby facilitating shaping of the third lens and avoiding bad shaping and generation of stress due to an the overly large surface curvature of the third lens L3. Preferably, the camera optical lens 10 further satisfies a condition of 3.01≤(R5+R6)/(R5−R6)≤4.96.

An on-axis thickness of the third lens L3 is defined as d5, and the camera optical lens 10 further satisfies a condition of 0.02≤d5/TTL≤0.07. This can facilitate achieving ultra-thin lenses. Preferably, the camera optical lens 10 further satisfies a condition of 0.04≤d5/TTL≤0.05.

In an embodiment, an object-side surface of the fourth lens L4 is convex in the paraxial region, an image-side surface of the fourth lens L4 is concave in the paraxial region, and the fourth lens L4 has a negative refractive power.

A focal length of the fourth lens L4 is defined as f4, and the camera optical lens 10 further satisfies a condition of −10.22≤f4/f≤−2.88. The appropriate distribution of refractive power makes it possible that the system has the better imaging quality and the lower sensitivity. Preferably, the camera optical lens 10 further satisfies a condition of −6.39≤f4/f≤−3.61.

A curvature radius of the object-side surface of the fourth lens L4 is defined as R7, a curvature radius of the image-side surface of the fourth lens L4 is defined as R8, and the camera optical lens 10 further satisfies a condition of 0.79≤(R7+R8)/(R7−R8)≤3.06, which specifies a shape of the fourth lens L4. Within this range, a development towards ultra-thin and wide-angle lens would facilitate correcting a problem like an off-axis aberration. Preferably, the camera optical lens 10 further satisfies a condition of 1.26≤(R7+R8)/(R7−R8)≤2.45.

An on-axis thickness of the fourth lens L4 is defined as d7, and the camera optical lens 10 further satisfies a condition of 0.03≤d7/TTL≤0.09. This can facilitate achieving ultra-thin lenses. Preferably, the camera optical lens 10 further satisfies a condition of 0.05≤d7/TTL≤0.07.

In an embodiment, an object-side surface of the fifth lens L5 is concave in the paraxial region, an image-side surface of the fifth lens L5 is convex in the paraxial region, and the fifth lens L5 has a positive refractive power.

A focal length of the fifth lens L5 is defined as f5, and the camera optical lens 10 further satisfies a condition of 0.29≤f5/f≤0.95, which can effectively make a light angle of the camera lens gentle and reduce an tolerance sensitivity. Preferably, the camera optical lens 10 further satisfies a condition of 0.47≤f5/f≤0.76.

A curvature radius of the object-side surface of the fifth lens L5 is defined as R9, a curvature radius of the image-side surface of the fifth lens L5 is defined as R10, and the camera optical lens 10 further satisfies a condition of 0.61≤(R9+R10)/(R9−R10)≤2.00, which specifies a shape of the fifth lens L5. Within this range, a development towards ultra-thin and wide-angle lenses can facilitate correcting a problem of the off-axis aberration. Preferably, the camera optical lens 10 further satisfies a condition of 0.98≤(R9+R10)/(R9−R10)≤1.60.

An on-axis thickness of the fifth lens L5 is defined as d9, and the camera optical lens 10 further satisfies a condition of 0.07≤d9/TTL≤0.22. This can facilitate achieving ultra-thin lenses. Preferably, the camera optical lens 10 further satisfies a condition of 0.11≤d9/TTL≤0.18.

In an embodiment, an object-side surface of the sixth lens L6 is concave in the paraxial region, an image-side surface of the sixth lens L6 is concave in the paraxial region, and the sixth lens L6 has a negative refractive power.

A focal length of the sixth lens L6 is defined as f6, and the camera optical lens 10 further satisfies a condition of −1.23≤f6/f≤−0.38. The appropriate distribution of refractive power makes it possible that the system has the better imaging quality and lower sensitivity. Preferably, the camera optical lens 10 further satisfies a condition of −0.77≤f6/f≤−0.47.

A curvature radius of the object-side surface of the sixth lens L6 is defined as R11, a curvature radius of the image-side surface of the sixth lens L6 is defined as R12, and the camera optical lens 10 further satisfies a condition of 0.30≤(R11+R12)/(R11−R12)≤1.10, which specifies a shape of the sixth lens L6. Within this range, a development towards ultra-thin and wide-angle lenses would facilitate correcting the problem of the off-axis aberration. Preferably, the camera optical lens 10 further satisfies a condition of 0.48≤(R11+R12)/(R11−R12)≤0.88.

An on-axis thickness of the sixth lens L6 is defined as d11, and the camera optical lens 10 further satisfies a condition of 0.04≤d11/TTL≤0.12. This can facilitate achieving ultra-thin lenses. Preferably, the camera optical lens 10 further satisfies a condition of 0.06≤d11/TTL≤0.10.

In an embodiment, a combined focal length of the first lens and of the second lens is defined as f12, and the camera optical lens 10 further satisfies a condition of 0.45≤f12/f≤1.37. This can eliminate the aberration and distortion of the camera optical lens and reduce a back focal length of the camera optical lens, thereby maintaining miniaturization of the camera optical lens. Preferably, the camera optical lens 10 further satisfies a condition of 0.72≤f12/f≤1.10.

In an embodiment, the total optical length TTL of the camera optical lens 10 is less than or equal to 5.34 mm, which is beneficial for achieving ultra-thin lenses. Preferably, the total optical length TTL of the camera optical lens 10 is less than or equal to 5.09 mm.

In an embodiment, an F number of the camera optical lens 10 is less than or equal to 2.08. The camera optical lens has a large aperture and a better imaging performance. Preferably, the F number of the camera optical lens 10 is less than or equal to 2.04.

With such designs, the total optical length TTL of the camera optical lens 10 can be made as short as possible, thus the miniaturization characteristics can be maintained.

In the following, examples will be used to describe the camera optical lens 10 of the present disclosure. The symbols recorded in each example will be described as follows. The focal length, on-axis distance, curvature radius, on-axis thickness, inflexion point position, and arrest point position are all in units of mm.

TTL: Optical length (the total optical length from the object-side surface of the first lens to the image surface of the camera optical lens along the optical axis) of the camera optical lens 10 in mm.

Preferably, inflexion points and/or arrest points can be arranged on the object-side surface and/or the image-side surface of the lens, so as to satisfy the demand for high quality imaging. The description below can be referred for specific implementations.

The design data of the camera optical lens 10 in Embodiment 1 of the present disclosure are shown in Table 1 and Table 2.

TABLE 1 R d nd vd S1 ∞ d0= −0.045 R1 2.191 d1= 0.487 nd1 1.5449 v1 55.93 R2 −17.599 d2= 0.057 R3 −24.454 d3= 0.405 nd2 1.5449 v2 55.93 R4 −15.592 d4= 0.104 R5 3.540 d5= 0.215 nd3 1.6713 v3 19.24 R6 2.055 d6= 0.353 R7 24.384 d7= 0.302 nd4 1.6510 v4 21.51 R8 8.338 d8= 0.284 R9 −8.213 d9= 0.671 nd5 1.5449 v5 55.93 R10 −1.165 d10= 0.511 R11 −9.627 d11= 0.403 nd6 1.5449 v6 55.93 R12 1.492 d12= 0.747 R13 ∞ d13= 0.210 ndg 1.5168 vg 64.17 R14 ∞ d14= 0.100

In the table, meanings of various symbols will be described as follows.

-   -   S1: aperture;     -   R: curvature radius of an optical surface, a central curvature         radius for a lens;     -   R1: curvature radius of the object-side surface of the first         lens L1;     -   R2: curvature radius of the image-side surface of the first lens         L1;     -   R3: curvature radius of the object-side surface of the second         lens L2;     -   R4: curvature radius of the image-side surface of the second         lens L2;     -   R5: curvature radius of the object-side surface of the third         lens L3;     -   R6: curvature radius of the image-side surface of the third lens         L3;     -   R7: curvature radius of the object-side surface of the fourth         lens L4;     -   R8: curvature radius of the image-side surface of the fourth         lens L4;     -   R9: curvature radius of the object-side surface of the fifth         lens L5;     -   R10: curvature radius of the image-side surface of the fifth         lens L5;     -   R11: curvature radius of the object-side surface of the sixth         lens L6;     -   R12: curvature radius of the image-side surface of the sixth         lens L6;     -   R13: curvature radius of an object-side surface of the optical         filter GF;     -   R14: curvature radius of an image-side surface of the optical         filter GF;     -   d: on-axis thickness of a lens and an on-axis distance between         lens;     -   d0: on-axis distance from the aperture S1 to the object-side         surface of the first lens L1;     -   d1: on-axis thickness of the first lens L1;     -   d2: on-axis distance from the image-side surface of the first         lens L1 to the object-side surface of the second lens L2;     -   d3: on-axis thickness of the second lens L2;     -   d4: on-axis distance from the image-side surface of the second         lens L2 to the object-side surface of the third lens L3;     -   d5: on-axis thickness of the third lens L3;     -   d6: on-axis distance from the image-side surface of the third         lens L3 to the object-side surface of the fourth lens L4;     -   d7: on-axis thickness of the fourth lens L4;     -   d8: on-axis distance from the image-side surface of the fourth         lens L4 to the object-side surface of the fifth lens L5;     -   d9: on-axis thickness of the fifth lens L5;     -   d10: on-axis distance from the image-side surface of the fifth         lens L5 to the object-side surface of the sixth lens L6;     -   d11: on-axis thickness of the sixth lens L6;     -   d12: on-axis distance from the image-side surface of the sixth         lens L6 to the optical filter GF;     -   d13: on-axis thickness of the optical filter GF;     -   d14: on-axis distance from the image-side surface to the image         surface of the optical filter GF;     -   nd: refractive index of the d line;     -   nd1: refractive index of the d line of the first lens L1;     -   nd2: refractive index of the d line of the second lens L2;     -   nd3: refractive index of the d line of the third lens L3;     -   nd4: refractive index of the d line of the fourth lens L4;     -   nd5: refractive index of the d line of the fifth lens L5;     -   nd6: refractive index of the d line of the sixth lens L6;     -   ndg: refractive index of the d line of the optical filter GF;     -   vd: abbe number;     -   v1: abbe number of the first lens L1;     -   v2: abbe number of the second lens L2;     -   v3: abbe number of the third lens L3;     -   v4: abbe number of the fourth lens L4;     -   v5: abbe number of the fifth lens L5;     -   v6: abbe number of the sixth lens L6;     -   vg: abbe number of the optical filter GF.

Table 2 shows aspherical surface data of the camera optical lens 10 in Embodiment 1 of the present disclosure.

TABLE 2 Conic coefficient Aspheric surface coefficients k A4 A6 A8 A10 A12 A14 A16 R1 −9.9128E−02  −3.9662E−02 −1.0952E−01  7.7256E−02 1.1012E−01 −5.9173E−01 6.9450E−01 −2.6344E−01  R2 0.0000E+00 −7.0531E−02 3.8747E−03 −3.0525E−02  2.9698E−02 −1.4265E−02 0.0000E+00 0.0000E+00 R3 0.0000E+00  6.2793E−02 4.8450E−02 2.7830E−03 1.2494E−02  1.6331E−03 −2.6115E−02  1.2915E−02 R4 0.0000E+00  4.8229E−02 −3.7469E−02  2.3385E−02 0.0000E+00  0.0000E+00 0.0000E+00 0.0000E+00 R5 0.0000E+00 −1.5271E−01 −2.5888E−04  8.0159E−03 7.1128E−03  6.8933E−03 2.1722E−02 −1.7354E−02  R6 −8.8526E+00  −1.1444E−02 −2.2294E−02  4.3178E−02 −7.5468E−03  −3.2594E−03 6.3846E−03 −5.3727E−04  R7 0.0000E+00 −1.5472E−01 8.0784E−02 4.6223E−03 −2.3521E−02  −8.0011E−03 1.7029E−02 −6.8145E−03  R8 0.0000E+00 −1.6945E−01 4.7499E−02 1.6571E−03 −4.5327E−03  −2.7988E−03 1.4900E−03 3.2720E−04 R9 −7.0934E+01  −5.6604E−02 −3.6640E−02  1.8979E−02 2.3806E−04 −3.8851E−03 −1.6816E−04  6.7823E−04 R10 −3.3616E+00  −6.0638E−02 1.9740E−02 −2.5857E−03  −1.3509E−03   5.5473E−04 3.7110E−04 −1.3403E−04  R11 0.0000E+00 −3.4226E−02 8.2288E−03 −6.6255E−04  3.0662E−05 −1.2719E−06 −9.4750E−08  1.3314E−08 R12 −7.7250E+00  −3.2602E−02 5.8697E−03 −7.7995E−04  3.6465E−05 −1.8673E−07 −7.2413E−08  1.1079E−08

Here, K is a conic coefficient, and A4, A6, A8, A10, A12, A14, and A16 are aspheric surface coefficients.

IH: Image height

y=(x ² /R)/[1+{1−(k+1)(x ² /R ²)}^(1/2)]+A4x ⁴ +A6x ⁶ +A8x ⁸ +A10x ¹⁰ +A12x ¹² +A14x ¹⁴ +A16x ¹⁶  (1)

For convenience, an aspheric surface of each lens surface uses the aspheric surfaces shown in the above formula (1). However, the present disclosure is not limited to the aspherical polynomials form shown in the formula (1).

Table 3 and Table 4 show design data of inflexion points and arrest points of the camera optical lens 10 according to Embodiment 1 of the present disclosure. P1R1 and P1R2 represent the object-side surface and the image-side surface of the first lens L1, P2R1 and P2R2 represent the object-side surface and the image-side surface of the second lens L2, P3R1 and P3R2 represent the object-side surface and the image-side surface of the third lens L3, P4R1 and P4R2 represent the object-side surface and the image-side surface of the fourth lens L4, P5R1 and P5R2 represent the object-side surface and the image-side surface of the fifth lens L5, P6R1 and P6R2 represent the object-side surface and the image-side surface of the sixth lens L6. The data in the column named “inflexion point position” refer to vertical distances from inflexion points arranged on each lens surface to the optic axis of the camera optical lens 10. The data in the column named “arrest point position” refer to vertical distances from arrest points arranged on each lens surface to the optical axis of the camera optical lens 10.

TABLE 3 Number(s) of Inflexion point Inflexion point Inflexion point inflexion points position 1 position 2 position 3 P1R1 1 0.615 P1R2 0 P2R1 1 0.225 P2R2 1 0.385 P3R1 3 0.405 0.945 1.075 P3R2 0 P4R1 1 0.155 P4R2 2 0.255 1.215 P5R1 1 1.325 P5R2 2 1.315 1.515 P6R1 1 1.675 P6R2 2 0.725 2.795

TABLE 4 Number(s) of Arrest point arrest points position 1 P1R1 1 0.925 P1R2 0 P2R1 1 0.375 P2R2 1 0.715 P3R1 1 0.705 P3R2 0 P4R1 1 0.265 P4R2 1 0.435 P5R1 0 P5R2 0 P6R1 1 2.525 P6R2 1 1.725

FIG. 2 and FIG. 3 illustrate a longitudinal aberration and a lateral color with wavelengths of 470.0 nm, 550.0 nm and 650.0 nm after passing the camera optical lens 10 according to Embodiment 1, respectively. FIG. 4 illustrates a field curvature and a distortion with a wavelength of 550.0 nm after passing the camera optical lens 10 according to Embodiment 1. A field curvature S in FIG. 4 is a field curvature in a sagittal direction, and T is a field curvature in a tangential direction.

Table 13 in the following shows various values of Embodiments 1, 2, 3 and values corresponding to parameters which are specified in the above conditions.

As shown in Table 13, Embodiment 1 satisfies the above conditions.

In this Embodiment, an entrance pupil diameter of the camera optical lens is 1.882 mm, an image height of 1.0H is 3.284 mm, a FOV (field of view) in a diagonal direction is 82.78°. Thus, the camera optical lens has a wide-angle and is ultra-thin. Its on-axis and off-axis aberrations are fully corrected, thereby achieving excellent optical characteristics.

Embodiment 2

Embodiment 2 is basically the same as Embodiment 1 and involves symbols having the same meanings as Embodiment 1, and only differences therebetween will be described in the following.

Table 5 and Table 6 show design data of a camera optical lens 20 in Embodiment 2 of the present disclosure.

TABLE 5 R d nd vd S1 ∞ d0= −0.045 R1 2.214 d1= 0.485 nd1 1.5449 v1 55.93 R2 −13.637 d2= 0.087 R3 −15.459 d3= 0.402 nd2 1.5449 v2 55.93 R4 −12.504 d4= 0.062 R5 3.432 d5= 0.220 nd3 1.6713 v3 19.24 R6 2.035 d6= 0.378 R7 25.527 d7= 0.297 nd4 1.6510 v4 21.51 R8 8.032 d8= 0.285 R9 −9.083 d9= 0.684 nd5 1.5449 v5 55.93 R10 −1.176 d10= 0.512 R11 −8.216 d11= 0.393 nd6 1.5449 v6 55.93 R12 1.522 d12= 0.734 R13 ∞ d13= 0.210 ndg 1.5168 vg 64.17 R14 ∞ d14= 0.100

Table 6 shows aspherical surface data of each lens of the camera optical lens 20 in Embodiment 2 of the present disclosure.

TABLE 6 Conic coefficient Aspheric surface coefficients k A4 A6 A8 A10 A12 A14 A16 R1 −1.1651E−01  −4.0884E−02 −1.0906E−01  7.8533E−02 1.1281E−01 −5.9359E−01 6.8968E−01 −2.5963E−01  R2 0.0000E+00 −7.8437E−02 8.0080E−03 −2.8516E−02  3.1551E−02 −1.6867E−02 0.0000E+00 0.0000E+00 R3 0.0000E+00  6.0865E−02 4.8463E−02 5.4834E−03 1.3049E−02  3.7536E−04 −2.6851E−02  1.3239E−02 R4 0.0000E+00  5.1788E−02 −4.6861E−02  2.3889E−02 3.4178E−04  2.4857E−03 0.0000E+00 0.0000E+00 R5 0.0000E+00 −1.5427E−01 2.8764E−03 7.4421E−03 6.6442E−03  7.1251E−03 2.2255E−02 −1.6291E−02  R6 −8.8566E+00  −1.1375E−02 −1.9394E−02  4.4156E−02 −7.9812E−03  −4.3736E−03 6.6502E−03 4.3227E−04 R7 0.0000E+00 −1.5577E−01 7.5159E−02 3.1224E−03 −2.2246E−02  −6.8910E−03 1.7570E−02 −8.0198E−03  R8 0.0000E+00 −1.7059E−01 4.7367E−02 6.7051E−04 −4.3871E−03  −2.5869E−03 1.5223E−03 2.5194E−04 R9 −7.3215E+01  −5.7791E−02 −3.7360E−02  1.8748E−02 3.2024E−04 −3.7995E−03 −1.3587E−04  6.4732E−04 R10 −3.4031E+00  −6.2626E−02 1.8878E−02 −2.8015E−03  −1.3422E−03   5.8498E−04 3.7647E−04 −1.3369E−04  R11 0.0000E+00 −3.3529E−02 8.2469E−03 −6.6371E−04  3.0450E−05 −1.2325E−06 −9.0734E−08  1.2503E−08 R12 −7.9862E+00  −3.2428E−02 5.8866E−03 −7.9325E−04  3.6516E−05 −6.4174E−08 −6.7050E−08  1.0414E−08

Table 7 and table 8 show design data of inflexion points and arrest points of each lens of the camera optical lens 20 lens according to Embodiment 2 of the present disclosure.

TABLE 7 Number(s) of Inflexion point Inflexion point inflexion points position 1 position 2 P1R1 1 0.615 P1R2 0 P2R1 1 0.285 P2R2 1 0.455 P3R1 2 0.405 0.915 P3R2 0 P4R1 1 0.155 P4R2 2 0.255 1.235 P5R1 1 1.325 P5R2 2 1.335 1.535 P6R1 1 1.675 P6R2 2 0.725 2.785

TABLE 8 Number of Arrest point Arrest point arrest points position 1 position 2 P1R1 1 0.925 P1R2 0 P2R1 1 0.455 P2R2 1 0.845 P3R1 2 0.725 1.045 P3R2 0 P4R1 1 0.255 P4R2 1 0.445 P5R1 0 P5R2 0 P6R1 1 2.525 P6R2 1 1.705

FIG. 6 and FIG. 7 illustrate a longitudinal aberration and a lateral color of light with wavelengths of 470.0 nm, 550.0 nm and 650.0 nm after passing the camera optical lens 20 according to Embodiment 2. FIG. 8 illustrates a field curvature and a distortion of light with a wavelength of 550.0 nm after passing the camera optical lens 20 according to Embodiment 2.

As shown in Table 13, Embodiment 2 satisfies the above conditions.

In an embodiment, an entrance pupil diameter of the camera optical lens is 1.901 mm, an image height of 1.0H is 3.284 mm, a FOV (field of view) in the diagonal direction is 80.76°. Thus, the camera optical lens has a wide-angle and is ultra-thin. Its on-axis and off-axis aberrations are fully corrected, thereby achieving excellent optical characteristics.

Embodiment 3

Embodiment 3 is basically the same as Embodiment 1 and involves symbols having the same meanings as Embodiment 1, and only differences therebetween will be described in the following.

Table 9 and Table 10 show design data of a camera optical lens 30 in Embodiment 3 of the present disclosure.

TABLE 9 R d nd vd S1 ∞ d0= −0.050 R1 2.209 d1= 0.493 nd1 1.5449 v1 55.93 R2 −11.814 d2= 0.103 R3 −9.883 d3= 0.396 nd2 1.5449 v2 55.93 R4 −8.995 d4= 0.035 R5 3.266 d5= 0.220 nd3 1.6713 v3 19.24 R6 1.994 d6= 0.382 R7 37.402 d7= 0.293 nd4 1.6510 v4 21.51 R8 8.370 d8= 0.290 R9 −11.189 d9= 0.708 nd5 1.5449 v5 55.93 R10 −1.132 d10= 0.437 R11 −5.962 d11= 0.402 nd6 1.5449 v6 55.93 R12 1.500 d12= 0.781 R13 ∞ d13= 0.210 ndg 1.5168 vg 64.17 R14 ∞ d14= 0.100

Table 10 shows aspherical surface data of each lens of the camera optical lens 30 in Embodiment 3 of the present disclosure.

TABLE 10 Conic coefficient Aspherical surface coefficients k A4 A6 A8 A10 A12 A14 A16 R1 −2.2550E−01  −4.1382E−02 −1.1062E−01  7.4626E−02 1.1427E−01 −5.9316E−01 6.8720E−01 −2.5757E−01  R2 0.0000E+00 −9.1529E−02 1.3472E−02 −2.7220E−02  3.0163E−02 −1.6938E−02 0.0000E+00 0.0000E+00 R3 0.0000E+00  5.9826E−02 5.3696E−02 9.6316E−03 1.3267E−02 −1.5645E−03 −2.7986E−02  1.4043E−02 R4 0.0000E+00  6.0057E−02 −5.1264E−02  2.4900E−02 2.8876E−04  3.6802E−03 0.0000E+00 0.0000E+00 R5 0.0000E+00 −1.6453E−01 6.6962E−03 5.1929E−03 7.0720E−03  7.9704E−03 2.2454E−02 −1.6036E−02  R6 −8.7884E+00  −1.5318E−02 −1.8875E−02  4.8486E−02 −8.5427E−03  −6.7282E−03 6.6775E−03 1.6660E−03 R7 0.0000E+00 −1.5349E−01 7.0272E−02 5.1188E−03 −2.1260E−02  −6.9447E−03 1.7134E−02 −7.8502E−03  R8 0.0000E+00 −1.7249E−01 4.9900E−02 −7.7983E−04  −4.8044E−03  −2.4933E−03 1.5712E−03 3.6291E−04 R9 −9.1605E+00  −5.6558E−02 −3.5644E−02  1.9081E−02 −1.8166E−04  −3.9686E−03 −1.3692E−04  6.8853E−04 R10 −3.4310E+00  −6.7449E−02 1.9979E−02 −2.5583E−03  −1.2207E−03   5.9278E−04 3.6955E−04 −1.3932E−04  R11 0.0000E+00 −3.1718E−02 8.5085E−03 −6.5209E−04  2.8367E−05 −1.6453E−06 −1.1738E−07  1.6465E−08 R12 −8.8470E+00  −3.3183E−02 5.9165E−03 −8.0486E−04  3.6867E−05  2.1527E−08 −5.9306E−08  1.0140E−08

Table 11 and Table 12 show design data inflexion points and arrest points of the respective lenses in the camera optical lens 30 according to Embodiment 3 of the present disclosure.

TABLE 11 Number(s) of Inflexion point Inflexion point inflexion points position 1 position 2 P1R1 1 0.605 P1R2 0 P2R1 1 0.335 P2R2 1 0.525 P3R1 2 0.405 0.915 P3R2 0 P4R1 1 0.125 P4R2 2 0.255 1.215 P5R1 1 1.325 P5R2 2 1.315 1.525 P6R1 1 1.625 P6R2 2 0.695 2.755

TABLE 12 Number of Arrest point Arrest point arrest points position 1 position 2 P1R1 1 0.905 P1R2 0 P2R1 1 0.545 P2R2 1 0.895 P3R1 2 0.725 1.035 P3R2 0 P4R1 1 0.215 P4R2 1 0.435 P5R1 0 P5R2 0 P6R1 0 P6R2 1 1.645

FIG. 10 and FIG. 11 illustrate a longitudinal aberration and a lateral color of light with wavelengths of 470.0 nm, 550.0 nm and 650.0 nm after passing the camera optical lens 30 according to Embodiment 3. FIG. 12 illustrates a field curvature and a distortion of light with a wavelength of 550.0 nm after passing the camera optical lens 30 according to Embodiment 3.

Table 13 in the following lists values corresponding to the respective conditions in an embodiment according to the above conditions. Obviously, the embodiment satisfies the above conditions.

In an embodiment, an entrance pupil diameter of the camera optical lens is 1.904 mm, an image height of 1.0H is 3.284 mm, a FOV (field of view) in the diagonal direction is 80.67°. Thus, the camera optical lens has a wide-angle and is ultra-thin. Its on-axis and off-axis aberrations are fully corrected, thereby achieving excellent optical characteristics.

TABLE 13 Parameters and conditions Embodiment 1 Embodiment 2 Embodiment 3 f 3.801 3.803 3.807 f1 3.594 3.520 3.446 f2 77.402 114.103 158.141 f3 −7.663 −7.869 −8.110 f4 −19.421 −17.949 −16.469 f5 2.401 2.397 2.245 f6 −2.332 −2.314 −2.150 f12 3.480 3.463 3.433 FNO 2.02 2.00 2.00 f2/f3 −10.10 −14.50 −19.50 d2/d4 0.55 1.40 2.90

It can be appreciated by one having ordinary skill in the art that the description above is only embodiments of the present disclosure. In practice, one having ordinary skill in the art can make various modifications to these embodiments in forms and details without departing from the scope of the present disclosure. 

What is claimed is:
 1. A camera optical lens comprising, from an object side to an image side: a first lens having a positive refractive power; a second lens having a positive refractive power; a third lens having a negative refractive power; a fourth lens; a fifth lens; and a sixth lens; wherein the camera optical lens satisfies following conditions: −20.00≤f2/f3≤−10.00; and 0.50≤d2/d4≤3.00; where f2 denotes a focal length of the second lens; f3 denotes a focal length of the third lens; d2 denotes an on-axis distance from an image-side surface of the first lens to an object-side surface of the second lens; and d4 denotes an on-axis distance from an image-side surface of the second lens to an object-side surface of the third lens.
 2. The camera optical lens according to claim 1 further satisfying following conditions: −19.75≤f2/f3≤−10.05; and 0.53≤d2/d4≤2.95.
 3. The camera optical lens according to claim 1, wherein an object-side surface of the first lens is convex in a paraxial region and the image-side surface of the first lens is convex in the paraxial region; and the camera optical lens further satisfies following conditions: 0.45≤f1/f≤1.42; −1.56≤(R1+R2)/(R1−R2)≤−0.46; and 0.05≤d1/TTL≤0.15; where f denotes a focal length of the camera optical lens, f1 denotes a focal length of the first lens, R1 denotes a curvature radius of the object-side surface of the first lens; R2: denotes a curvature radius of the image-side surface of the first lens; d1 denotes an on-axis thickness of the first lens; and TTL denotes a total optical length from the object-side surface of the first lens to an image surface of the camera optical lens along an optical axis.
 4. The camera optical lens according to claim 3 further satisfying following conditions: 0.72≤f1/f≤1.13; −0.97≤(R1+R2)/(R1−R2)≤−0.57; and 0.08≤d1/TTL≤0.12.
 5. The camera optical lens according to claim 1, wherein the second lens comprises the object-side surface being concave in a paraxial region and the image-side surface being convex in the paraxial region; and the camera optical lens further satisfies following conditions: 10.18≤f2/f≤62.31; 2.26≤(R3+R4)/(R3−R4)≤31.90; and 0.04≤d3/TTL≤0.13; where f denotes a focal length of the camera optical lens; R3 denotes a curvature radius of the object-side surface of the second lens; R4 denotes a curvature radius of the image-side surface of the second lens; d3 denotes an on-axis thickness of the second lens; and TTL denotes a total optical length from an object-side surface of the first lens to an image surface of the camera optical lens along an optical axis.
 6. The camera optical lens according to claim 5 further satisfying following conditions: 16.29≤f2/f≤49.85; 3.61≤(R3+R4)/(R3−R4)≤25.52; and 0.07≤d3/TTL≤0.10.
 7. The camera optical lens according to claim 1, wherein the third lens comprises the object-side surface being convex in a paraxial region and an image-side surface being concave in the paraxial region, and the camera optical lens further satisfies following conditions: −4.26≤f3/f≤−1.34; 1.88≤(R5+R6)/(R5−R6)≤6.20; and 0.02≤d5/TTL≤0.07; where f denotes a focal length of the camera optical lens; R5 denotes a curvature radius of the object-side surface of the third lens; R6 denotes a curvature radius of the image-side surface of the third lens; d5 denotes an on-axis thickness of the third lens; and TTL denotes a total optical length from an object-side surface of the first lens to an image surface of the camera optical lens along an optical axis.
 8. The camera optical lens according to claim 7 further satisfying following conditions: −2.66≤f3/f≤−1.68; 3.01≤(R5+R6)/(R5−R6)≤4.96; and 0.04≤d5/TTL≤0.05.
 9. The camera optical lens according to claim 1, wherein the fourth lens has a negative refractive power, and comprises an object-side surface being convex in a paraxial region and an image-side surface being concave in the paraxial region, and the camera optical lens further satisfies following conditions: −10.22≤f4/f≤−2.88; 0.79≤(R7+R8)/(R7−R8)≤3.06; and 0.03≤d7/TTL≤0.09; where f denotes a focal length of the camera optical lens; f4 denotes a focal length of the fourth lens; R7 denotes a curvature radius of the object-side surface of the fourth lens; R8 denotes a curvature radius of the image-side surface of the fourth lens; d7 denotes an on-axis thickness of the fourth lens; and TTL denotes a total optical length from an object-side surface of the first lens to an image surface of the camera optical lens along an optical axis.
 10. The camera optical lens according to claim 9 further satisfying following conditions: −6.39≤f4/f≤−3.61; 1.26≤(R7+R8)/(R7−R8)≤2.45; and 0.05≤d7/TTL≤0.07.
 11. The camera optical lens according to claim 1, wherein the fifth lens has a positive refractive power, and comprises an object-side surface being concave in a paraxial region and an image-side surface being convex in the paraxial region, and the camera optical lens further satisfies following conditions: 0.29≤f5/f≤0.95; 0.61≤(R9+R10)/(R9−R10)≤2.00; and 0.07≤d9/TTL≤0.22; where f denotes a focal length of the camera optical lens; f5 denotes a focal length of the fifth lens; R9 denotes a curvature radius of the object-side surface of the fifth lens; R10 denotes a curvature radius of the image-side surface of the fifth lens; d9 denotes an on-axis thickness of the fifth lens; and TTL denotes a total optical length from an object-side surface of the first lens to an image surface of the camera optical lens along an optical axis.
 12. The camera optical lens according to claim 11 further satisfying following conditions: 0.47≤f5/f≤0.76; 0.98≤(R9+R10)/(R9−R10)≤1.60; and 0.11≤d9/TTL≤0.18.
 13. The camera optical lens according to claim 1, wherein the sixth lens has a negative refractive power, and comprises an object-side surface being concave in a paraxial region and an image-side surface being concave in the paraxial region, and the camera optical lens further satisfies following conditions: −1.23≤f6/f≤−0.38; 0.30≤(R11+R12)/(R11−R12)≤1.10; and 0.04≤d11/TTL≤0.12; where f denotes a focal length of the camera optical lens; f6 denotes a focal length of the sixth lens; R11 denotes a curvature radius of the object-side surface of the sixth lens; R12 denotes a curvature radius of the image-side surface of the sixth lens; d11 denotes an on-axis thickness of the sixth lens; and TTL denotes a total optical length from an object-side surface of the first lens to an image surface of the camera optical lens along an optical axis.
 14. The camera optical lens according to claim 13 further satisfying following conditions: −0.77≤f6/f≤−0.47; 0.48≤(R11+R12)/(R11−R12)≤0.88; and 0.06≤d11/TTL≤0.10.
 15. The camera optical lens according to claim 1 further satisfying following condition: 0.45≤f12/f≤1.37; where f denotes a focal length of the camera optical lens; and f12 denotes a combined focal length of the first lens and the second lens.
 16. The camera optical lens according to claim 15 further satisfying following condition: 0.72≤f12/f≤1.10.
 17. The camera optical lens according to claim 1, where a total optical length TTL from an object-side surface of the first lens to an image surface of the camera optical lens along an optical axis is less than or equal to 5.34 mm.
 18. The camera optical lens according to claim 17, wherein the total optical length TTL of the camera optical lens is less than or equal to 5.09 mm.
 19. The camera optical lens according to claim 1, wherein an F number of the camera optical lens is less than or equal to 2.08.
 20. The camera optical lens according to claim 19, wherein the F number of the camera optical lens is less than or equal to 2.04. 